Krone information

I have a document in my great grandfather's writing, made when he went back to Germany in 1911 searching for information.John Herman Krone went back to Germany and located the cities, church records and made copies.It has our Krone family line back to 1776 in Berlin.What is more interesting is that the cover is inscribed with "Descended from the Swedish Royal Family".It starts with Christian Krone b. 1776 in Berlin.I will be happy to share information with interested parties.